Knowledge Management System of Northwest Institute of Plateau Biology, CAS
| Productivity and persistence of perennial grass mixtures under competition from annual weeds in the alpine region of the Qinghai-Tibetan Plateau | |
| Dong, SK; Long, RJ; Hu, ZZ; Kang, MY | |
| 2005-04-01 | |
| 发表期刊 | WEED RESEARCH
 |
| 卷号 | 45期号:2页码:114-120 |
| 文章类型 | Article |
| 摘要 | In the alpine region of the Qinghai-Tibetan Plateau four indigenous perennial grass species Bromus inermis (BI), Elymus sibiricus (ES), Elymus nutans (EN) and Agropyron cristatum (AC) were cultivated as three mixtures with different compositions and seeding rates, BI + EN, BI + ES + AC and BI + ES + EN + AC. From 1998 to 2001 there were three different weeding treatments: never weeded (CK); weeded on three occasions in the first year (1-y) and weeded on three occasions in both the first and second year (2-y) and their effect of grass combination and interactions on sward productivity and persistence was measured. Intense competitive interference by weedy annuals reduced dry matter (DM) yield of the swards. Grass combination significantly affected sward DM yields, leaf area index (LAI) and foliar canopy cover and also species composition DM and LAI, and species plant cover. Interaction between weeding treatments and grass combination was significant for sward DM yield, LAI and canopy cover, but not on species composition for DM, LAI or species plant cover. Grass mixture BI + ES + EN + AC gave the highest sward DM yield and LAI for both weeding and non-weeding treatments. Species ES and EN were competitively superior to the others. Annual weedy forbs must be controlled to obtain productive and stable mixtures of perennial grasses, and germination/emergence is the most important time for removal. Weeding three times (late May, late June and mid-July) in the establishment year is enough to maintain the production and persistence of perennial grass mixtures in the following growing seasons. Extra weeding three times in the second growing year makes only a slight improvement in productivity.; In the alpine region of the Qinghai-Tibetan Plateau four indigenous perennial grass species Bromus inermis (BI), Elymus sibiricus (ES), Elymus nutans (EN) and Agropyron cristatum (AC) were cultivated as three mixtures with different compositions and seeding rates, BI + EN, BI + ES + AC and BI + ES + EN + AC. From 1998 to 2001 there were three different weeding treatments: never weeded (CK); weeded on three occasions in the first year (1-y) and weeded on three occasions in both the first and second year (2-y) and their effect of grass combination and interactions on sward productivity and persistence was measured. Intense competitive interference by weedy annuals reduced dry matter (DM) yield of the swards. Grass combination significantly affected sward DM yields, leaf area index (LAI) and foliar canopy cover and also species composition DM and LAI, and species plant cover. Interaction between weeding treatments and grass combination was significant for sward DM yield, LAI and canopy cover, but not on species composition for DM, LAI or species plant cover. Grass mixture BI + ES + EN + AC gave the highest sward DM yield and LAI for both weeding and non-weeding treatments. Species ES and EN were competitively superior to the others. Annual weedy forbs must be controlled to obtain productive and stable mixtures of perennial grasses, and germination/emergence is the most important time for removal. Weeding three times (late May, late June and mid-July) in the establishment year is enough to maintain the production and persistence of perennial grass mixtures in the following growing seasons. Extra weeding three times in the second growing year makes only a slight improvement in productivity. |
| 关键词 | Perennial Grass Mixtures Annual Weeds Sward Yield Sward Persistence Alpine Region |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 学科领域 | 农业科学 |
| 关键词[WOS] | DRY-MATTER ; INTENSITY ; GRADIENT |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Agriculture ; Plant Sciences |
| WOS类目 | Agronomy ; Plant Sciences |
| WOS记录号 | WOS:000227351300005 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://210.75.249.4/handle/363003/1381 |
| 专题 | 中国科学院西北高原生物研究所 |
| 作者单位 | 1.Beijing Normal Univ, Environm Sch, Beijing 100875, Peoples R China 2.Chinese Acad Sci, NW Plateau Inst Biol, Xining, Peoples R China 3.Gansu Agr Univ, Grassland Sci Coll, Lanzhou, Peoples R China 4.Beijing Normal Univ, Coll Resource Sci, Beijing 100875, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, SK,Long, RJ,Hu, ZZ,et al. Productivity and persistence of perennial grass mixtures under competition from annual weeds in the alpine region of the Qinghai-Tibetan Plateau[J]. WEED RESEARCH,2005,45(2):114-120. |
| APA | Dong, SK,Long, RJ,Hu, ZZ,&Kang, MY.(2005).Productivity and persistence of perennial grass mixtures under competition from annual weeds in the alpine region of the Qinghai-Tibetan Plateau.WEED RESEARCH,45(2),114-120. |
| MLA | Dong, SK,et al."Productivity and persistence of perennial grass mixtures under competition from annual weeds in the alpine region of the Qinghai-Tibetan Plateau".WEED RESEARCH 45.2(2005):114-120. |
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